Ecco the Dolphin

3E3 4B8 C46 Infinite air
050 AC8 6E6 Less air when you jump out of the water
003 4B8 C46 Air goes down slower
21C D49 6E2 Infinite energy
05C D29 199 Take less damage
FFC D29 199 Protection from some hazards
C93 E2A 6EE No replenishment of air energy by anything--you
can still get air by jumping out of water
217 AD8 6E2 No extra air when jumping out of the water--use
this code with code air goes down slower for a level
053 EAA 6E6 + 053 E4A 6E6 Shells replenish less energy and less air